Upsilon by SignalAF — AI Operator Measurement Engine
An A2A client finds this agent by fetching the well-known path on the provider's own host. That is what makes an agent card different from every other agent artifact in this catalog: it is provider-published by construction — it cannot be derived, generated, or reconstructed on a provider's behalf.
https://signalaf.com/api/mcp
· transport MCP
AI Operator Leaderboard leaderboard
Get the current top-N AI operator rankings by Yield (Υ)
Operator Profile operator
Get a single operator's full profile, metrics, and rank
Metric Definitions metrics
Get definitions and formulas for SigRank core and product metrics
Portable Upsilon Measurement Record standard-record
Create a sigrank/0.1-draft record from I/O/W/R telemetry. The base record excludes Construction, Build Archetypes, and RS05.
Hall of Signal hall-of-signal
Get all-time records and badge holders
Compare Operators compare
Head-to-head comparison of two operators
Discover Peers and Mentors discover-peers
Find mentors (1-2 class tiers above with similar cascade shapes + pillar deltas), peers (same tier), and complementary operators (whose strength is your weakness). Uses enrolled device identity — no codename needed.
2026-10-30 from https://signalaf.com/.well-known/agent-card.json,
HTTP 200. The body was saved verbatim and is the sole source for
everything on this page — no field is inferred.
View the captured card.
Providers change what they serve; if this card has moved or changed shape,
the provider profile carries the
current state as of the last build.
Work with this as data
Every agent card here is available over the APIs.io API and to AI agents over MCP. A2A Agent Cards is not yet its own endpoint on the v1 API. Reach it through catalog search and the tag graph, or the MCP server.